| http://www.w3.org/ns/prov#value | - ##STR21## a naphthyl group; an alkylbenzyl group or a mono or poly-substituted benzylalkoxy group, of formula: ##STR22## (wherein R7 is an alkyl group containing from 1 to 4 carbon atoms); or Z is a nitrogenous group --NR8 R9 wherein R8 and R9, like or different from each other, are hydrogen atoms or, individually or both groups R6 as defined above, or, when R8 is H, R9 can be a group ##STR23## o
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